drivers/gpu/drm/gma500/intel_bios.c

   1 /*
   2  * Copyright (c) 2006 Intel Corporation
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  16  *
  17  * Authors:
  18  *    Eric Anholt <eric@anholt.net>
  19  *
  20  */
  21 #include <drm/drmP.h>
  22 #include <drm/drm.h>
  23 #include "gma_drm.h"
  24 #include "psb_drv.h"
  25 #include "psb_intel_drv.h"
  26 #include "psb_intel_reg.h"
  27 #include "intel_bios.h"
  28
  29
  30 static void *find_section(struct bdb_header *bdb, int section_id)
  31 {
  32         u8 *base = (u8 *)bdb;
  33         int index = 0;
  34         u16 total, current_size;
  35         u8 current_id;
  36
  37         /* skip to first section */
  38         index += bdb->header_size;
  39         total = bdb->bdb_size;
  40
  41         /* walk the sections looking for section_id */
  42         while (index < total) {
  43                 current_id = *(base + index);
  44                 index++;
  45                 current_size = *((u16 *)(base + index));
  46                 index += 2;
  47                 if (current_id == section_id)
  48                         return base + index;
  49                 index += current_size;
  50         }
  51
  52         return NULL;
  53 }
  54
  55 static void fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode,
  56                         struct lvds_dvo_timing *dvo_timing)
  57 {
  58         panel_fixed_mode->hdisplay = (dvo_timing->hactive_hi << 8) |
  59                 dvo_timing->hactive_lo;
  60         panel_fixed_mode->hsync_start = panel_fixed_mode->hdisplay +
  61                 ((dvo_timing->hsync_off_hi << 8) | dvo_timing->hsync_off_lo);
  62         panel_fixed_mode->hsync_end = panel_fixed_mode->hsync_start +
  63                 dvo_timing->hsync_pulse_width;
  64         panel_fixed_mode->htotal = panel_fixed_mode->hdisplay +
  65                 ((dvo_timing->hblank_hi << 8) | dvo_timing->hblank_lo);
  66
  67         panel_fixed_mode->vdisplay = (dvo_timing->vactive_hi << 8) |
  68                 dvo_timing->vactive_lo;
  69         panel_fixed_mode->vsync_start = panel_fixed_mode->vdisplay +
  70                 dvo_timing->vsync_off;
  71         panel_fixed_mode->vsync_end = panel_fixed_mode->vsync_start +
  72                 dvo_timing->vsync_pulse_width;
  73         panel_fixed_mode->vtotal = panel_fixed_mode->vdisplay +
  74                 ((dvo_timing->vblank_hi << 8) | dvo_timing->vblank_lo);
  75         panel_fixed_mode->clock = dvo_timing->clock * 10;
  76         panel_fixed_mode->type = DRM_MODE_TYPE_PREFERRED;
  77
  78         /* Some VBTs have bogus h/vtotal values */
  79         if (panel_fixed_mode->hsync_end > panel_fixed_mode->htotal)
  80                 panel_fixed_mode->htotal = panel_fixed_mode->hsync_end + 1;
  81         if (panel_fixed_mode->vsync_end > panel_fixed_mode->vtotal)
  82                 panel_fixed_mode->vtotal = panel_fixed_mode->vsync_end + 1;
  83
  84         drm_mode_set_name(panel_fixed_mode);
  85 }
  86
  87 static void parse_backlight_data(struct drm_psb_private *dev_priv,
  88                                 struct bdb_header *bdb)
  89 {
  90         struct bdb_lvds_backlight *vbt_lvds_bl = NULL;
  91         struct bdb_lvds_backlight *lvds_bl;
  92         u8 p_type = 0;
  93         void *bl_start = NULL;
  94         struct bdb_lvds_options *lvds_opts
  95                                 = find_section(bdb, BDB_LVDS_OPTIONS);
  96
  97         dev_priv->lvds_bl = NULL;
  98
  99         if (lvds_opts)
 100                 p_type = lvds_opts->panel_type;
 101         else
 102                 return;
 103
 104         bl_start = find_section(bdb, BDB_LVDS_BACKLIGHT);
 105         vbt_lvds_bl = (struct bdb_lvds_backlight *)(bl_start + 1) + p_type;
 106
 107         lvds_bl = kzalloc(sizeof(*vbt_lvds_bl), GFP_KERNEL);
 108         if (!lvds_bl) {
 109                 dev_err(dev_priv->dev->dev, "out of memory for backlight data\n");
 110                 return;
 111         }
 112         memcpy(lvds_bl, vbt_lvds_bl, sizeof(*vbt_lvds_bl));
 113         dev_priv->lvds_bl = lvds_bl;
 114 }
 115
 116 /* Try to find integrated panel data */
 117 static void parse_lfp_panel_data(struct drm_psb_private *dev_priv,
 118                             struct bdb_header *bdb)
 119 {
 120         struct bdb_lvds_options *lvds_options;
 121         struct bdb_lvds_lfp_data *lvds_lfp_data;
 122         struct bdb_lvds_lfp_data_entry *entry;
 123         struct lvds_dvo_timing *dvo_timing;
 124         struct drm_display_mode *panel_fixed_mode;
 125
 126         /* Defaults if we can't find VBT info */
 127         dev_priv->lvds_dither = 0;
 128         dev_priv->lvds_vbt = 0;
 129
 130         lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
 131         if (!lvds_options)
 132                 return;
 133
 134         dev_priv->lvds_dither = lvds_options->pixel_dither;
 135         if (lvds_options->panel_type == 0xff)
 136                 return;
 137
 138         lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
 139         if (!lvds_lfp_data)
 140                 return;
 141
 142
 143         entry = &lvds_lfp_data->data[lvds_options->panel_type];
 144         dvo_timing = &entry->dvo_timing;
 145
 146         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode),
 147                                       GFP_KERNEL);
 148         if (panel_fixed_mode == NULL) {
 149                 dev_err(dev_priv->dev->dev, "out of memory for fixed panel mode\n");
 150                 return;
 151         }
 152
 153         dev_priv->lvds_vbt = 1;
 154         fill_detail_timing_data(panel_fixed_mode, dvo_timing);
 155
 156         if (panel_fixed_mode->htotal > 0 && panel_fixed_mode->vtotal > 0) {
 157                 dev_priv->lfp_lvds_vbt_mode = panel_fixed_mode;
 158                 drm_mode_debug_printmodeline(panel_fixed_mode);
 159         } else {
 160                 dev_dbg(dev_priv->dev->dev, "ignoring invalid LVDS VBT\n");
 161                 dev_priv->lvds_vbt = 0;
 162                 kfree(panel_fixed_mode);
 163         }
 164         return;
 165 }
 166
 167 /* Try to find sdvo panel data */
 168 static void parse_sdvo_panel_data(struct drm_psb_private *dev_priv,
 169                       struct bdb_header *bdb)
 170 {
 171         struct bdb_sdvo_lvds_options *sdvo_lvds_options;
 172         struct lvds_dvo_timing *dvo_timing;
 173         struct drm_display_mode *panel_fixed_mode;
 174
 175         dev_priv->sdvo_lvds_vbt_mode = NULL;
 176
 177         sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
 178         if (!sdvo_lvds_options)
 179                 return;
 180
 181         dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
 182         if (!dvo_timing)
 183                 return;
 184
 185         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
 186
 187         if (!panel_fixed_mode)
 188                 return;
 189
 190         fill_detail_timing_data(panel_fixed_mode,
 191                         dvo_timing + sdvo_lvds_options->panel_type);
 192
 193         dev_priv->sdvo_lvds_vbt_mode = panel_fixed_mode;
 194
 195         return;
 196 }
 197
 198 static void parse_general_features(struct drm_psb_private *dev_priv,
 199                        struct bdb_header *bdb)
 200 {
 201         struct bdb_general_features *general;
 202
 203         /* Set sensible defaults in case we can't find the general block */
 204         dev_priv->int_tv_support = 1;
 205         dev_priv->int_crt_support = 1;
 206
 207         general = find_section(bdb, BDB_GENERAL_FEATURES);
 208         if (general) {
 209                 dev_priv->int_tv_support = general->int_tv_support;
 210                 dev_priv->int_crt_support = general->int_crt_support;
 211                 dev_priv->lvds_use_ssc = general->enable_ssc;
 212
 213                 if (dev_priv->lvds_use_ssc) {
 214                         dev_priv->lvds_ssc_freq
 215                                 = general->ssc_freq ? 100 : 96;
 216                 }
 217         }
 218 }
 219
 220 /**
 221  * psb_intel_init_bios - initialize VBIOS settings & find VBT
 222  * @dev: DRM device
 223  *
 224  * Loads the Video BIOS and checks that the VBT exists.  Sets scratch registers
 225  * to appropriate values.
 226  *
 227  * VBT existence is a sanity check that is relied on by other i830_bios.c code.
 228  * Note that it would be better to use a BIOS call to get the VBT, as BIOSes may
 229  * feed an updated VBT back through that, compared to what we'll fetch using
 230  * this method of groping around in the BIOS data.
 231  *
 232  * Returns 0 on success, nonzero on failure.
 233  */
 234 bool psb_intel_init_bios(struct drm_device *dev)
 235 {
 236         struct drm_psb_private *dev_priv = dev->dev_private;
 237         struct pci_dev *pdev = dev->pdev;
 238         struct vbt_header *vbt = NULL;
 239         struct bdb_header *bdb;
 240         u8 __iomem *bios;
 241         size_t size;
 242         int i;
 243
 244         bios = pci_map_rom(pdev, &size);
 245         if (!bios)
 246                 return -1;
 247
 248         /* Scour memory looking for the VBT signature */
 249         for (i = 0; i + 4 < size; i++) {
 250                 if (!memcmp(bios + i, "$VBT", 4)) {
 251                         vbt = (struct vbt_header *)(bios + i);
 252                         break;
 253                 }
 254         }
 255
 256         if (!vbt) {
 257                 dev_err(dev->dev, "VBT signature missing\n");
 258                 pci_unmap_rom(pdev, bios);
 259                 return -1;
 260         }
 261
 262         bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
 263
 264         /* Grab useful general definitions */
 265         parse_general_features(dev_priv, bdb);
 266         parse_lfp_panel_data(dev_priv, bdb);
 267         parse_sdvo_panel_data(dev_priv, bdb);
 268         parse_backlight_data(dev_priv, bdb);
 269
 270         pci_unmap_rom(pdev, bios);
 271
 272         return 0;
 273 }
 274
 275 /**
 276  * Destroy and free VBT data
 277  */
 278 void psb_intel_destroy_bios(struct drm_device *dev)
 279 {
 280         struct drm_psb_private *dev_priv = dev->dev_private;
 281         struct drm_display_mode *sdvo_lvds_vbt_mode =
 282                                 dev_priv->sdvo_lvds_vbt_mode;
 283         struct drm_display_mode *lfp_lvds_vbt_mode =
 284                                 dev_priv->lfp_lvds_vbt_mode;
 285         struct bdb_lvds_backlight *lvds_bl =
 286                                 dev_priv->lvds_bl;
 287
 288         /*free sdvo panel mode*/
 289         if (sdvo_lvds_vbt_mode) {
 290                 dev_priv->sdvo_lvds_vbt_mode = NULL;
 291                 kfree(sdvo_lvds_vbt_mode);
 292         }
 293
 294         if (lfp_lvds_vbt_mode) {
 295                 dev_priv->lfp_lvds_vbt_mode = NULL;
 296                 kfree(lfp_lvds_vbt_mode);
 297         }
 298
 299         if (lvds_bl) {
 300                 dev_priv->lvds_bl = NULL;
 301                 kfree(lvds_bl);
 302         }
 303 }